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COMP1070 Lecture #3

COMP1070 Lecture #3. Operating Systems Describe briefly operating systems service To describe character and graphical user interfaces To describe different types of operating systems Little UNIX( what UNIX is ) Go to lab 106. Introduction.

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COMP1070 Lecture #3

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  1. COMP1070Lecture #3 Operating Systems Describe briefly operating systems service To describe character and graphical user interfaces To describe different types of operating systems Little UNIX( what UNIX is ) Go to lab 106

  2. Introduction The primary propose of an operating system is to facilitate easy, efficient, fair, orderly and secure use of commuter system resources. It allows the user of computer system to use application software – email, Web, word processors language libraries, system calls Hardware resources which include, keyboard, display, memory, drives and CPU . AUI – application user interface API- application programmers interface

  3. Figure 1 A layered view of a contemporary computer system

  4. What is an Operating system AUI is glued to operating systems kernel via the language libraries and system call interface. System calls- a set of functions that can be used by applications and library routines to start execution of the kernel code for particular service, reading or writing a file.. The kernel is the part of an operating system where the real work is done Operating system can be viewed as resource manager

  5. Operating system Services The major operating system services therefore provide mechanisms for secure and efficient • Execution of a program • I/O operations performed by program • Communication between processes • Error detection and reporting • Manipulation of all kind of files

  6. Character and Graphical User Interfaces If you use keyboard to issue commands to the operating system - CUI If the primary device for issuing commands to the operating system is a point and click devise (mouse) then we say that the operating system has – GUI Some operating system have both and you can use either. Operating systems like UNIX and DOS they have –CUI MacOS, OS/2, Microsoft Windows - GUI

  7. Types of Operating Systems Operating systems can be categorized by number of users who can use a system at the same time and number of processes that operating system can run simultaneously. • Single user, single process system ( PC, mMacOS, Dos, Windows3.1) • Single user, multiprocesses system (PC, OS/2, Windows NT workstations) • Multiuser, multiprocess system UNIX, LINUX, Windows NT Server

  8. HW #3 Go down Lab 106 RS Building. Comp 1070 Lab 1 1.Introduction to computing environment in Math & CS department at NCCU. · Computer Labs: Room 106, Room 209 · Computers: PCs running windows 2000 with Ethernet connection (Room 106), SiliconGraphics machines running Unix (Room 209) · Servers: picard (NT/2000), laplace (LINUX) · Useful software: C/C++ Java compilers, Textpad, Putty.exe, etc 2.Logging into course website: a. Open a web browser such as IE or Netscape b. Enter the following address: http://onlinecourse.nccu.edu c. Click on login button d. Enter user name and password. ( e. Click intro to computing under My Courses f. When you want to get out, click logout button on top.

  9. 3.Logging into UNIX machine (Laplace) a. Open putty.exe ( click putty.exe icon on desctop) b. Enter IP address: 152.9.45.20 and check SSH button under Protocol. c. Click Open. d. Another window pops up and it says: login as: e. Enter your user name. Your user name is composed of your last name and first letter of your first name. E.g., the user name of John Doe is doej.(username must be in all lowercase letters !!) f. Initial password is comp1000. You can of course change it later. g. Try some simple UNIX commands such as: pwd, cd, and ls. 4.Logging out of UNIX machine a. It is very important that you log out at the end of each session. b. Enter logout at a prompt. Do not forget your password If you need a help Do Not Hesitate Ask for It Welcome back to Laplace very soon

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